Question

Gadolinium belongs to 4f series. Its atomic number is 64.
Which of the following is the correct electronic configuration
of gadolinium?
(a) [Xe]4f⁷ 5d¹6s² (b) [Xe]4f⁶ 5d²6s²
(c) [Xe]4f⁸ 6d² (d) [Xe]4f⁹ 5s¹

Answer 1

Answer:

The correct option is (a) [Xe]4f⁷ 5d¹6s² (

Answer 2

The correct electronic configuration of Gadolinium is (a) $[Xe]4f^75d^16s^2$.

Explanation:

• The electronic configuration of the element depends upon its atomic number.
• As the atomic number of Gadolinium is 64, its electronic configuration is $1s^22s^22p^63s^23p^63d^{10}4s^24p^64d^{10}5s^25p^64f^75d^16s^2$.
• Xenon is a noble gas with an atomic number is 54. Its electronic configuration is  $1s^22s^22p^63s^23p^63d^{10}4s^24p^64d^{10}5s^25p^6$.
• As the electronic configuration of gadolinium and Xenon is similar till $5p^6$, it is written as $[Xe]4f^75d^16s^2$.
• Thus the correct electronic configuration of gadolinium is (a) $[Xe]4f^75d^16s^2$.

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